EP 0607135 B1 19970716 - PULSATION NOZZLE, FOR SELF-EXCITED OSCILLATION OF A DRILLING FLUID JET STREAM
Title (en)
PULSATION NOZZLE, FOR SELF-EXCITED OSCILLATION OF A DRILLING FLUID JET STREAM
Title (de)
PULSIERUNGSDÜSE FÜR SELBSTERREGTE SCHWINGUNG EINER BOHRFLÜSSIGKEITSSTRAHLSTRÖMUNG
Title (fr)
AJUTAGE A PULSATIONS DESTINES AUX OSCILLATIONS AUTO-EXCITEES D'UN JET DE FLUIDE DE FORAGE
Publication
Application
Priority
GB 9101790 W 19911015
Abstract (en)
[origin: WO9308365A1] A pulsation nozzle is adapted for insertion in a drill bit such as a single body or tri-cone bit, for delivery of a pulsed jet of thixotropic drilling fluid during drilling operations. The nozzle defines an inlet orifice (33) communicating with an internal cavity (32) and an outlet orifice (31), the dimensions of which are chosen in such a way as to induce the cyclical propagation of disturbances in a shear boundary defined between fluid passing directly through the nozzle and fluid which is momentarily trapped in the cavity, thereby inducing a self-excited oscillating flow of said fluid within the nozzle, and a rapid pulsing flow emitting from the nozzle.
IPC 1-7
IPC 8 full level
E21B 7/18 (2006.01); E21B 7/24 (2006.01); E21B 10/60 (2006.01); E21B 10/61 (2006.01)
CPC (source: EP US)
E21B 7/24 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
WO 9308365 A1 19930429; AU 659105 B2 19950511; AU 8666291 A 19930521; BG 98770 A 19950630; BR 9107323 A 19951024; CA 2121232 A1 19930429; DE 69126891 D1 19970821; DE 69126891 T2 19980115; EP 0607135 A1 19940727; EP 0607135 B1 19970716; FI 941741 A0 19940415; FI 941741 A 19940614; JP H07504722 A 19950525; NO 305407 B1 19990525; NO 941349 D0 19940414; NO 941349 L 19940614; RU 2081292 C1 19970610; US 5495903 A 19960305; ZA 927918 B 19930421
DOCDB simple family (application)
GB 9101790 W 19911015; AU 8666291 A 19911015; BG 9877094 A 19940512; BR 9107323 A 19911015; CA 2121232 A 19911015; DE 69126891 T 19911015; EP 91919337 A 19911015; FI 941741 A 19940415; JP 51648991 A 19911015; NO 941349 A 19940414; RU 94022471 A 19911015; US 21168694 A 19940908; ZA 927918 A 19921014